Insulator pin



Jan. 14, 1941. B. R. s. ADAMS INSULATOR PIN Filed Sept. 25, 1939 S Y E N R O T T A iatented Jan. 14, 1941 UNITE!) STATES i A'iENT OFFICE 1 Claim.

This invention relates to insulator pins and particularly to means for securing insulator pins to a cross arm or other support.

An object of the present invention is to provide a pin, preferably formed of insulating material such as Bakelite, which will not deteriorate under severe conditions or service, provided in the lower end with a concave recess, and with openings extending through the wall of the recess in an upwardly and outwardly direction, to: receive securing nails which may be readily driven into the cross arm or other support to anchor the pin against displacement.

' A further object is to provide a device of this character which will be simple and durable, which will be inexpensive to manufacture, and which will not easily get out of order.

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claim without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming a part of this specification:

Figure 1 is a cross sectional view of an insulator and cross arm showing an insulator pin constructed in accordance with the invention.

Figure 2 is a side elevation of a modified form of the insulator pin.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, l0 designates a conventional glass insulator having a threaded bore I I to receive an insulator pin and having circumferential grooves I2 to receive conductor wires. I3 designates a conventional cross arm formed of Wood.

In carrying out the invention an insulator pin I 4 is provided, the same having a substantially frustro conical body portion terminating in cylindrical threaded portion I5 adapted to be screwed into the threaded axial bore II of the insulator Ill. The pin is provided below the frustro conical portion with a reduced cylindrical portion I6 having concave recess I! in the bottom. The bottom portion I 6 of the pin is of suflicient length to pass through the cross arm I3 and expose the recess I! to view on the bottom face of the cross arm.

A plurality of openings I8 are formed to extend through the wall of the concave recess IT in an upwardly and outwardly inclined direction. These openings are adapted to receive nails I9 which may be driven into the cross arm, the concave recess permitting entry of a driving tool to set the heads of the nails firmly against the wall of the concave recess.

A modified form of the invention is shown in Figure 2 in which the pin 20 is identical with the construction of a pin just described except that the pin is hollow, that is, it is provided with a longitudinal bore 2 I. This tends to make the pin lighter in weight while the strength of the pin is maintained.

In a modified form of pin a concave recess ZI is formed in the bottom of the pin and a plurality of nail receiving openings 22 are formed in the wall of the concave recess and extend in an upwardly and outwardly inclined direction.

In practice it has been found that a pin of the above described type will not deteriorate under severe conditions of service and cannot become dislodged from place by conductor wires since the nails are driven in the direction of any pull caused by vibrating wires and positively hold the pin in place.

It will be pointed out that a shoulder 23 is formed at the juncture at the frusto conical portion and the lower reduced cylindrical portion of the pin to seat upon the upper face of the cross arm and prevent any tendency of the pin working downward from applied position.

From the above description it is thought that the construction and operation of the invention will be fully understood without further explanation.

What is claimed is:

The combination with a cross arm, of an insulator pin engaged through the cross arm and terminating at the bottom flush with the bottom surface of the cross arm, a shoulder on the pin fitting snugly against the top face of the cross arm, there being a concave recess formed in the bottom of the pin, guide openings extending obliquely upward from near the inner end of the recess and opening through the side of the pin, and nails in said openings driven obliquely into the cross arm and having their heads disposed against the wall of the recess, said concave recess permitting entry of a driving tool to set the heads of the nails firmly against the wall of the recess above the bottom of the cross arm.

BASIL R. S. ADAMS. 

